RVL DIAG
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RVL_UJI_DIAG is a factory disc with ID 121J. It is interesting because it does not seem to be hash checked.
TMD details
RVL_UJI_DIAG has a single content with type 0x2 and hash 934db10dacfe4f410d83e8e6456767b68bd91a7a (4 bytes), which turns out to be 0xADDEFECA (0xCAFEDEAD in the opposite byte order).
Because the real disc has been seen, and it has a real UI, 0xCAFEDEAD is clearly not the actual disc. It is therefore probably the case that this content does not receive any form of verification.
The lack of verification is most likely a result of the 0x2 content type; there are a few other TMDs with this type (namely 123J, 0000dead, 122E, and 0000), which can probably all be used to bypass signatures.